Brake mechanism



April 15, 1930- w. .1. GEESON 1,754,355

BRAKE MEGHANI SM Filed Decv 15. 1927 Patented Apr. 15, 1930 PATENT OFFICE V WILLIAM JOHN GEESON, F PORT COLBORNE, ONTARIO, CANADA.

BRAKE MECHANISM Original application filed October 16, 1926, Serial No. 142,105. Divided and. this application filed December 15, 1927.

This application is a division of my copending application No. 142,105, filed October 16th, 1926.

In the handling of heavy hoisting machinery it is frequently found necessary to use complicated lever mechanisms or power applied levers in order to apply sufficient pressure on the brake drum to arrest the drum and hold the load, and the object of my invention is to devise apparatus whereby the power of the load is utilized to apply the brake.

As in the co-pending application I attain my object by applying the brake for holding 16 the load through the rotative movement of a free member adapted to be frictionally con nected with the main load handling brake drum. In the present case the free member is formed as a disk slidable longitudinally on a shaft, said free member being adapted to frictionally engage a second disk fast on the shaft, which shaft is geared to the main load handling brake drum.

The construction is hereinafter more fully described and illustrated in the accompanying drawings in which i Fig. 1 is a plan view of the device, partly in section; and 1 Fig. 2 an end elevation of the main drum and gearing.

In the drawings like numerals of reference indicate corresponding parts in the dif ferent figures. V

1 is the hoisting drum, which is supported on a shaft 2 carried by the standards 3.

The main brake band 1, surrounding the brake drum 5 on the hoisting drum, is anchored at the end 6 to the base and the free end 7 is connected to the end 8 of a bell crank lever 9 which is mounted on a fixed pivot 10 on one of the standards 3.

Mounted on the main brake drum 5 is a gear ring 11. A pinion 12 meshing with the ring 11 is mounted on a shaft 13 which 625-- tends through a casing 14:, and a disk 15 is secured to this shaft within the casing. A friction disk 16 is slidably arranged on the shaft and is adapted to frictionally engage the disk 15. A lever 17, fulcrumed on a bracket 18 on the casing 14:, is adapted to connected with the other end of said lever and Serial No. 240,220.

move the disk 16 longitudinally of the shaft 13 to engage said disk 16 with the disk 15.

The disk 16 is formed with a grooved periphery and a cable 19 is secured in this groove and extends outside the casing 14 and is attached to the end 20 of the operating lever 9 of the brake band 4 which operates on the main drum 5.

With this arrangement, the friction disc may be operated in oil if desired.

The operation of the device is as follows. By actuating the lever 17 the friction disk 16 is moved into engagement with the disk 15, thus causing the disk 16 to be rotated with the disk 15. Through the rotation of the disk 16, the cable 19 is drawn upon to rock the lever 9 to tighten the brake band 4: against the drum 5'. As the disk 15, through the gearing is rotated by the load, it will be seen that the load itself is used to effect the braking of the drum.

It will be readily understood that a comparatively light pressure on the lever 17 will be suliicient to hold the friction disk 16 against the disk 15 to effect the application of a very heavy pressure on the main brake band, quite sufficient to hold the main drum securely.

In brake mechanism, the combination with a support; a drum rotatably mounted in said support; a brake band adapted to frictionally engage said drum and having one end connected to said support; a lever pivoted intermediate its ends and-having one end connected with the other end of said brake band; a gear rotatable with said drum; a rotatable shaft; a pinion rotatable with said shaft and meshing with said gear; a friction disk fast on said shaft; a friction diskrotatable on and slidable axially of said shaft; a cable having one end connected to and adapted to be wound on said second mentioned friction disk, the other end of said cable being means for moving said second disk into frictional engagement of the first mentioned disk. Signed at Toronto, Canada, this 6th day of December, 1927.

- WILLIAM JOHN GEESON. 

